Automatic transmission
a transmission and automatic technology, applied in the direction of mechanical actuated clutches, couplings, transportation and packaging, etc., can solve the problems of vibration of the vehicle body, insufficient lubrication of the starting clutch, and fluctuation of torque in the output shaft of the engine, etc., to achieve the effect of simple structur
Inactive Publication Date: 2022-05-19
MAZDA MOTOR CORP
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The invention provides a simple way to lubricate the starting clutch in an automatic transmission when the car is stopped. This is achieved by adding a lubrication system to the clutch mechanism.
Problems solved by technology
In a vehicle having the automatic transmission coupled to an engine, torque fluctuation occurs in an output shaft of the engine due to intermittent explosion in each cylinder of the engine.
When the torque fluctuation of the engine is transmitted to the output member side of the automatic transmission, the torque fluctuation is transmitted from the output member of the automatic transmission to the drive wheel, so that vibration of a vehicle body might occur.
In the case where the clutch drum is connected to the transmission mechanism, the clutch drum does not rotate during stopping of the vehicle, and thus the oil supplied from the radial-direction inner side to the outer side cannot be held in an outer-side cylindrical portion of the clutch drum, so that the lubrication of the starting clutch might become insufficient.
Method used
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Embodiment Construction
[0036]Hereinafter, an embodiment of the present disclosure will be described.
[0037]FIG. 1 illustrates a configuration of an automatic transmission 1 on a drive source side in the embodiment of the present disclosure, and its surroundings. The automatic transmission 1 according to the embodiment of the present disclosure is coupled to an engine (not illustrated) as a drive source without via a fluid transfer device such as a torque converter. The engine is an in-line four-cylinder engine in which four cylinders are disposed in line, which is not limited to this, and torque fluctuation occurs twice while a crankshaft which is an output shaft 3 of the engine rotates once.
[0038]The automatic transmission 1 includes a transmission mechanism 2 having a plurality of planetary gear sets and a plurality of friction fastening elements such as a clutch and a brake, and a starting clutch 4 disposed between the transmission mechanism 2 and the engine. It should be noted that in the present embod...
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An automatic transmission includes a starting clutch which connects and disconnects motive power between an engine and a transmission mechanism. The starting clutch includes a clutch hub connected to the engine, a clutch drum connected to the transmission mechanism, a friction plate provided between the clutch hub and the clutch drum, and a piston which presses the friction plate. The clutch drum has a radial-direction portion extending from an end portion of the outer-side cylindrical portion on a first axial-direction side to the radial-direction inner side, and an annular oil dam member extending from an end portion of the outer-side cylindrical portion on a second axial-direction side to the radial-direction inner side to immerse the friction plate in oil supplied from the radial-direction inner side toward the outer side, together with the outer-side cylindrical portion and the radial-direction portion.
Description
TECHNICAL FIELD[0001]The present disclosure relates to an automatic transmission.BACKGROUND ART[0002]In an automatic transmission mounted on a vehicle such as an automobile, typically, a motive power transmitting path of a transmission mechanism using a plurality of planetary gear mechanisms is switched by selectively fastening a plurality of friction fastening elements such as a clutch and a brake to form a shift stage according to an operational state of the vehicle.[0003]In a vehicle having the automatic transmission coupled to an engine, torque fluctuation occurs in an output shaft of the engine due to intermittent explosion in each cylinder of the engine. For example, in an in-line four-cylinder four-cycle engine, the torque fluctuation occurs twice while the output shaft of the engine rotates once, and this torque fluctuation is transmitted from the engine to the automatic transmission.[0004]The automatic transmission has, of a plurality of rotation elements forming the motive...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16D25/12F16D25/0638F16H59/42B60K17/02
CPCF16D25/123F16D25/0638F16D2125/06B60K17/02F16D2300/18F16H59/42F16H57/0473F16H57/0427F16H57/043F16H57/0471F16D13/74F16H57/0424F16H2057/0216F16D2300/06
Inventor IWASAKI, TATSUHIKOMIZOBE, TATSUTOSHINAKAMURA, KEIICHIYAMAGUCHI, MASAYA
Owner MAZDA MOTOR CORP